The standard answer is the Central Intelligence Agency, but that's incomplete.
The truth is the United States had, during the Cold War, seventeen agencies that conducted intelligence collection as at least part of their mission and with three exceptions (the National Security Agency, which does cryptography; the National Reconnaissance Office, which does satellite collection; and the National Photographic Interpretation Center, which did what its name implies) they all ran covert operations.
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If you're referring to the barrier that separated communist countries in Europe from non-communist countries, the answer is the Berlin Wall.
US and all of western europe
vietnam, cuba, china, burma, laos,
Answer this question… To spread anticommunist propaganda in communist countries
To promote democratic ideals in communist territories